Yes you can log hours flown abroad, however ensure you log them as required by your licence as there can be differences.
The classic one always quoted here is the fact that under FAA a safety pilot can also log P1 as well as the PIC, under JAA this is not allowed only one person can log P1.
I have never flown in Oz but there will probably be differences again as we always seem to do things differently to everyone else!
J.