The Australian Accent is renowned for its lack of regional differences. This is perhaps not surprising given that Britain settled the country fairly late in the history of the Empire (New South Wales was discovered over a decade after America’s Declaration of Independence). But it isn’t quite right to say Australian Accents exhibit no variation: those differences just aren’t particularly regional.
So if Australian accents don’t really vary by region, what kind of accent differences do exist? I’d refer you to the loose classification system developed by linguists Arthur Delbridge and A.G. Mitchell in 1965. They separated Australian Accents into broad, general, and cultivated varieties.