You would probably be advised to speak with Tesla and see if there will be any issues. You are obviously able to import into Australia under the Personal import rule (you must have had it registered in your name overseas for at least 12months), however, you may find difficulty gaining comprehensive car insurance for a Personal Import. You can only import a car under this rule once every 5 years.
Personally imported cars that are otherwise available via full volume import also tend to have much lower resale values. So it might be worth checking how much it would cost you to sell it in Hong Kong and purchase another Tesla new or used in Australia. Don't forget to calculate the import duties, GST, shipping, engineering fees etc etc.
Personally, IMHO, you would have to save a fair chunk of money before it would be worth the hassle. It is really only worth it for specialist collector/performance vehicles.
Adam.