The following page suggests it can use 100 to 240VAC, 50/60Hz, so
If That's True you should merely need a cord that fits both your outlet and the projector, or to cut and graft together a cord you have with the correct wall plug, and that cord with the correct projector plug.
https://van-eck.net/itable.php?lang=en&size=4&cat=film&merk=28&type=Cine Projector S-400
Really by graft I mean you can just cut the wall plug off and get the right DIY wall plug from a hardware store to put on, no need to joint two cables together. Replacement plugs usually have a shell that pops off and screw terminals inside to secure the wires, but I'm thinking of US plugs and merely assuming there are such things in Australia too.
I also read that there is a voltage setting switch on the bottom that should be switched to whichever setting is closest to your (230VAC?) Australian voltage.