Hi,
I think you'll find that Erlang developers in Australia are extremely rare. There aren't many jobs around for them either.
We had a small meetup group in Sydney, which has fallen quiet as I found I had less time to organise it. You're welcome to post to that group
http://www.meetup.com/Sydney-Erlang-User-Group/ to reach out to interested parties in Sydney.
Outside of that your best bet would be to contact the various Functional Programming groups in the capital cities, I'm really only familiar with Brisbane and Sydney groups, but I'd expect something similar exists in Melbourne. Depending on your company's view on hiring overseas the erlang questions mailing list might also be worth trying.
Regarding how active the Erlang community is, there's a handful of people in Sydney with more interest in Elixir from the JS and Ruby people I know. I'd say it's fairly quiet, and with the job prospects being fairly close to zero in Australia I don't really see that improving hugely. Having said that it's a great language, which I like very much.
Cheers,
Tim