Officially Sling TV is only available in the USA because of content distribution and copyright policies. However, you can still watch and get the Sling TV app by obtaining a US IP address via VPN. All you need to do is sign up for a VPN and download its app. Once you downloaded the app, sign in with your username and password and connect to the American server.  Now when the connection is established, head to the Sling TV website or app, sign in and start streaming in Australia.