WHK4
Your profile is a bit thin, so if you reduce our search area down from "Australia" we might help. It's a bit like asking for "flying training in Europe" or in "America" You live in a big country.
What state is convenient for you? Every state has its schools, and most can do sling training. If they do not have a machine rigged with a hook on site, they can get probably get one in.
Keep looking, and try a Google search