Floor paint i the obvious answer. There are two main sorts. The cheaper has a solvent that evaporates like normal paint. This will work fine. But if you fancy splashing out a few Baht's more get one of the epoxy-based floor paints.
They have two parts you mix together and they set by a chemical reaction. They tend to be more durable. Solvent-based paint may get scraped through by your motorcycle's side-stand pretty quickly.
The most expensive one is tiles, on the positive side it keeps your garage a bit cooler during the day.
I've just moved into a new house and it's got a garage I can park my Yamaha R1 in. I'm made up that it's out of the rain and away from prying eyes but the garage floor's a sort of powdery raw cement which is really dusty. What's the bet covering for it?