Can I submit my university applications and not send in act scores until later?

I am an Australian citizen but live in a foreign country, I'm applying to universities in Australia but I don't know if I should apply for international or Domestic. Also will I be allowed to send in my scores after the deadlines but have already sent in my applications?

The best thing to do is contact the admissions offices of the universities you're considering, and ask an admissions counselor what they would advise.