best way to get in contact with german speaking in australia?

There's a group in Canberra called the Canberra German speakers' network: http://arts.anu.edu.au/german_studies/Netzwerk/net...

If you contacted them, they may also know about other groups

The Goethe Institute might also be able to help you:

Here's a link to the Australian one:

http://www.goethe.de/ins/au/lp/enindex.htm

And here's a link to the New Zealand one in case that's more convenient:

http://www.goethe.de/ins/nz/wel/enindex.htm

Although I think they are more aimed at non-Germans interested in Germany than the other way round.

The following website also sets out to be a link between Australia and the German speaking nations of Europe, so they may have contacts with groups of German speakers:

http://zentrum.blogspot.com/

Hope one of those helps.