move to OZ but work in canada

I'm wondering if anyone knows what visa a person who doesn't need to work in OZ to pay the bills would get.

I'm a programmer who's got a bunch of contracts that have no end in sight, and at the same time do not require me to be anywhere specifically. I could easily work from OZ and my clients wouldn't even notice. In this respect, I'm like a freelance writer. As long as I got the net I can work wherever I want.

So, do people do this?
What's the visa they use?