Sandgropers are Western Australians.

In the same vein,
Queenslanders are bananbenders
New South Welshers are cornstalkers ("Cornstalk" is the mag of the NSW Folk Fed.)
Victorians are cabbagepatchers
Tasmanians are various things but I prefer Taswegians and Vandemonians
South Australians are often forgotten, partly because their boundaries kept shifting and because they administered everything we now call the NT, and
all this stuff started when there weren't enough people in the Northern Territory to take into consideration and the ACT didn't exist.

Those from NT call themselves Territorians (their unwillingness to lose the term will probably mean they will never achieve statehood, because "Territory" is a jurisdictional category "lower than" a State. North of Elliot (a dot alongside the Stuart Hwy roughly half way between Alice and Tennant Ck, most call themselves Top Enders whether they come from the Territory, the northern part of WA or FNQ (Queensland, from Townsville north); if you get half a chance, try and get to the Top End Folk Festival.

Cheers, Rowan