You can apply for the visa if you are:
You have to first apply for Temporary Partner Visa (subclass 820) to apply for Permanent Partner Visa (subclass 801). You must be in Australia when you apply for this visa. In certain circumstances, it can be granted where the relationship with your partner has ended. The temporary Partner Visa (subclass 820) lets you:
Once your Permanent Partner Visa (subclass 801) is approved, you can stay, work or study in Australia for an indefinite period; apply for Australian citizenship; receive social security payments; sponsor eligible relatives for permanent residence; travel to and from Australia for 5 years from the date your visa is granted.