Hi,
you will have to do a Bachelor of Science/ Physiotherapy first. Sports Physiotherapy is covered to a very basic level, like other areas of specialisation like mental health, gynaecology, etc.
The actual specialisation in Sports (Science or Exercise Science) comes later. You can do postgraduate corses or postgraduate diplomas or a masters programme. Or just start working in a Sports Clinic as a new grad.
Fyzzio