From your post it looks like you are interested in learning about commercial roasting. Many of us here are into home roasting on small roasters for our own use.
There are plenty of commercial roasters around Sydney, however not all would be interested in teaching.
One sponsor here who does it is Dennis at Cuppacoffee. Contact Dennis and also send an email to all Sponsors, by clicking on the spot at the bottom of the Site Sponsors list on the left of this page and tell them what you are after.
Why would you want to leave Sydney?