No. In Australia Physiotherapists are licensed as first contact health practitioners. So if you have a physical problem you would like help with you can book straight in without any referral.
Your Physio can refer you for an xray if required and also provide a sick certificate as necessary if the condition warrants it, and will refer you to liaise with your GP with your consent as necessary.
In the instance you are eligible and need to claim your treatment on Medicare through the enhanced primary care programme you will need to organise this with your GP prior to your first appointment.
Your Physio can also refer you for an xray if they think it’s required.