Mate, I hate to contradict you so bluntly, but: No.
(If you have a source for that opinion, I’d like to know it. Could be interesting to follow up.)
Just the opposite.
Japan as a nation never had any plan (as distinct from a long term ambition) to invade Australia, or even to pretend to invade it, although the IJN was keen to try an invasion with its marines. That doesn’t mean that Japan wasn’t posturing and threatening to do so in 1942, as Tojo did several times in radio and parliamentary comments.
Invading New Guinea and invading Australia were a Japanese cluster fuck from beginning to end. (I don’t actually know precisely what a cluster fuck means in American usage, but I love the expression and if New Guinea wasn’t one then I don’t know what would be. )
There wasn’t anywhere for a Japanese ruse to draw land forces away from by the second half on 1942 when the Papua New Guinea, and Guadalcanal, campaigns were launched by the Japanese. They held just about everything to the north and north west. The Aleutian aspect was too far away to be relevant.
New Guinea was never more than a provisional target in Japan’s original war aims.
It was, like most Japanese advances after the initial aims were secured, opportunistically rather than strategically inspired.
To understand in a relatively few words how Japan ended up there, and how in many respects they lost the war there, you won’t do much better than the link I gave earlier to Henry Frei’s paper http://ajrp.awm.gov.au/ajrp/remember.nsf/pages/NT00002FAA
To expand on a few points in Frei’s paper.
(Without wanting to teach you how to suck eggs :D) Anyone who doesn’t have a clear picture of the geography and distances, read what follows with a map beside you.
Rabaul was, strategically for the IJN, a sensible target to support Truk, but that in itself caused problems. The IJA regarded holding Rabaul as protecting Truk as a centre of IJN operations threatening the US in the central Pacific, but the IJN saw Rabaul as a centre of operations itself.
I’m oversimplifying it (I like saying that. It makes me sound like I know more than I do ;)) and I’ll expand on some earlier comments, but the IJN perception of Rabaul as a centre of operations led to the IJN seeing a need to protect Rabaul from Allied attacks, where the IJA was just defending Rabaul (after massacring a lot of Australians and others and doing other things you’d expect of that mongrel bunch at the time in and around Rabaul).
The problem for the IJN with Rabaul as a centre of operations was that the Allies could fly bombers from Townsville in north Queensland in Australia to bomb Rabaul and then land at Port Moresby in Papua on the way back to refuel on a round trip they couldn’t have made otherwise. The Japanese lacked a corresponding, and any, route to hit Townsville and its base which threatened Rabaul. So, if they took Moresby out of the equation, Rabaul was safe from Allied air attack.
Just to grasp the significance of Townsville, fairly early in the war Townsville was the biggest American air base outside the continental US.
Another advantage for Japan in taking Moresby was that it’s one of the few deep water natural harbours in the region, which of course backed up Rabaul and presented itself as a fresh centre of operations which might strangle Australian and Allied shipping through the relatively narrow Torres Strait between PNG and Australia.
This was important as just about everything that mattered in Australia, from productive capacity to things and people landed from the US, was on the east coast from Brisbane southwards to Melbourne and had to move by sea through the Torres Strait to Darwin or the north west to build a real threat to Japan’s southern flank in the NEI. Rail links lacked the capacity, while there were barely roads for some links.
Alternatively, any attempt to avoid the Torres Strait problem meant either an invasion fleet steaming through the Torres Strait where it was vulnerable to attacks from whatever was based at Moresby on sea or in the air, or a huge and probably insupportable expenditure in oil and tonnage in moving everything to assemble at Perth / Fremantle on the south west coast of the Australian continent and then steaming up from there, whether to Darwin as a fresh reassembly point or direct to somewhere in the NEI etc.
The IJN got carried away with victories and by early 1942 some elements were putting forward ideas like a one to two division raid down the middle of Australia from Darwin to Adelaide, which they thought might rattle us into surrender. Whether or not it would have worked, those plans show something that was consistently fatal in Japan’s understanding and planning and strategy. The people running the show had no idea what they were dealing with.
Read Henry Frei’s excellent Japan’s Southward Advance and Australia and you’ll see how ignorant the Japanese were of what was down here and how ambivalent they were about it, and how little they understood of it.
In a different way, it’s the same problem many of their leaders had with America. They didn’t understand it and they didn’t realise what was going to happen when they attacked it, because they were too bound up in their own narrow conceptions of Japanese excellence nurtured in a closed society lacking a real understanding of the outer world.
The same criticisms could be made of the Allies, and the Americans in particular, but America had everything Japan didn’t that mattered for war.
Too many leaders in Japan were too unsophisticated to realise that, and to realise that pissing off the remarkably diverse Americans unanimously as a nation is a very hard thing to do. But when anyone does it, then look out. About the only other time it’s been achieved before or after Pearl Harbor was 9/11, another sneak attack.
So, I’ll bring all this back to New Guinea, but first a digression.
In 1942 there was Papua, which was Australian soil thanks to a bit of aggressive colonial annexation by the Australian colony of Queensland in the late 19th century before Australia federated into a nation in 1901. New Guinea was a former German colony mandated to Australia after WWI. Ignoring Dutch New Guinea on the western half of the island, which was a colonial Dutch possession.
All the fighting in 1942, which was Japan’s initial assault in Papua New Guinea, took place on Australian soil in Papua, on the Kokoda Track, Milne Bay, Buna, Gona, and Sanananda. New Guinea came later.
All of that fighting was, from the Japanese side, aimed at little more than the short term tactical reinforcement and protection of Rabaul and support of Operation FS. There wasn’t any grand plan about invading Australia, let alone creating the impression that Australia was about to be invaded.
At best, Japan’s Papuan campaign was part of the Operation FS compromise between the IJA and IJN to allow the IJN to move eastwards to Fiji and the Solomons after the IJA had comprehensively rejected any attempt to invade Australia.
Operation FS and the IJN’s ambitious expansion pushed Japan into Guadalcanal, which was the campaign which finished Japan’s Pacific expansion and its attempts to implement Operation FS to isolate Australia from America, while Japan’s failure in Papua under Australian and American defence and then attack started the roll up of Japan back to its homeland.
Japan’s whole problem in the SWPA land area was that it never had a strategy, at grand strategy or military strategy levels, to explain why it went past the oil fields in the NEI which were the most important aim of its war, and why it failed to consolidate its forces to protect those gains instead of drifting further east and eventually bogging itself in a casualty and logistical killing field in Papua New Guinea from the point of its greatest early triumphs to its defeat, which is the only place it did that.
Japan’s land war southwards and eastwards after conquering the NEI was largely the consequence of IJN ambition and hubris rather than any coherent national or military strategy.
It demonstrates the wisdom of those pain in the arse MBA syndicate papers about a business usually ending up in deep shit if it doesn’t’ know exactly where it’s going, and plan properly to get there.
Or just the old saying: Don’t throw good money after bad.