In many cases, overseas visitors to Australia, who wish to drive and do not hold a permanent visa, will be regarded as 'visiting drivers' and can use their valid overseas licence to drive. Except for the Northern Territory (3 months), and New South Wales and Victoria (6 months), Australian states and territories allow visiting drivers to drive indefinitely on their overseas licence as long as it is current.
It is only when a person becomes a permanent resident or Australian citizen that they are required to take out an Australian issued driver licence.
Overseas licence holders staying in the Northern Territory, New South Wales or Victoria should contact the relevant licensing authority to check local requirements.