If you want to travel to Sydney most likely it is going to be via plane. Fortunately there are multiple airports in Australia which you can arrive at besides Sydney's international airport.
From the airport to Sydney There are a few options to travel to Syndey from the airport to Sydney's city center. Syndey's rail system offers a service called Airport Link. Simply take the Airport Link Train from the Domestic terminal to Central station and change trains at Central Station to get to any other location.
