No.
The law of marriage in Australia (which is non-religious)
does not allow for polygamous marriage (that is, more than one legal spouse at a time).
Your faith is irrelevant to the law about marriage in Australia.
As a matter of law in Australia, only one marriage at a time "counts",
no matter what the teaching of your faith says.
As a matter of law, religious doctrine (of any faith) that allows for second and later wives
has no effect in Australia - the second person cannot be a "wife".
Whatever the law is in the country where you are now, and regardless of religious doctrine,
so long as you are married to one person, then so far as the law in Australia is concerned,
you cannot be in a valid marriage with anyone else.
Note also that even validly marrying an Australian citizen does not create
an automatic right to live in Australia.
One further thing - If you lie about your marital status to get to Australia,
then you can be arrested and deported.