http://www.vicroads.vic.gov.au/H ... DriversLicences.htm
The requirement to change your overseas driver licence to a Victorian driver licence depends on whether your stay in Victoria is temporary or permanent.
If you are in Victoria on a temporary visa, you can drive on your overseas driver licence (it must be current and valid) for an indefinite period provided your overseas driver licence is in English (or you have an accompanying English translation or International Driving Permit).