Can I get some cheap hotels in Sydney, Australia as a tourist?

Tourist or otherwise, nothing is cheap in Australia and in particular not Sydney hotels.

Of course you can. Prices start at a cheap $400 a night. Cheap!

You hire a hotel room regardless of who you are. (It's not like you have to pay a different price to locals or anyone else....).

Depends on what you want / consider cheap etc...

There are back packers which are cheap. Otherwise look out for deals or watch the cheap hotel sites...

The cheapest places to stay in Sydney are backpacker hostels. If you want something a little more upmarket use websites like Wotif and Trivago for some good deals.