I am a citizen of Pakistan and currently hold an Australian Student Visa subclass 500. I want to apply for a spouse or sponsorship visa for my husband. We both applied for a student visa but unfortunately his visa application was refused. Before leaving Pakistan I registered our marriage in Pakistan. I am the second wife of my husband and in Pakistan it is legal to have more than one wife for a man. I need your kind assistance regarding visa application, and let me know if I can apply or sponsor a Spouse visa for my husband?
Your marriage will not be recognized in Australia.
This page on the recognition of foreign marriages in Australia says:
An overseas marriage is generally recognised in Australia if it
was a valid marriage in the overseas country, and
would have been a valid marriage here
Your marriage would not be valid in Australia because your husband was already married.
It's not out of the question that there is a loophole I am unaware of. You should consult a lawyer if you want to try to find one.