how an bse (nursing) from india get rn of australia ,while doing masters in australia

Starting point would be the state nursing board where you are studying. You also need to check whether your study visa will allow you to work

Usually there will be IELTS if English is not first language. All will depend on state you are applying but as far as I know it is required

Silverdragon is right. IELTS is one of the main requirements and currently the IELTS minimum band scores required are rising. Depending on which state you are applying for registration, the IELTS minimum band can be from 6.5 (Reading and Listening)/7.0 (Writing and Speaking) or a minimum of 7.0 in all bands.

Correct me if I'm wrong but I think you are currently in Sydney right? So your starting point would be to visit this website: www.nmb.nsw.gov.au

All ielts band should be 7