I'm in Melbourne, not Sydney, but generally speaking in Australia
there aren't a lot of options outside of the main casinos
(The Star, in Sydney) because the casinos all have government-granted monopolies. Which unfortunately means "low rake" is a foreign concept here
There's this place
, which I've never been to, but it does offer tournaments (not cash games, as far as I can tell).
Other than that you'll find a lot of "pub poker" games, but they tend to be self-dealt amateur-style affairs, that exist more to bring business to the venue than to give you a decent game of poker. Usually they're free to enter, but your only chance of winning any actual money is if you turn up every week and accumulate points to get into a grand final or something.