Have you bothered looking at the CASA website?
A quick search shows that there is one ATO (Approved Testing Officers) listed outside Australia:
James Scott Finlayson New Zealand +64 021966245
[email protected] Helicopter NVFR, CIR
Therefore, NZ is probably your only option for training outside of Australia. (However, note that Mr Finlayson doesn't do PPL or CPL tests).