As I say you will need to do a BSc in Physiotherapy (there are a number of unis that do it including Liverpool, Coventry, Manchester Met, Birmingham, Keele etc) you can find all the others on the UCAS website. To get into uni you will either need to do A-levels or a BTEC national diploma or equiv. external courses you might want to consider doing are a 1st aid course, sports taping and sports massage (but there isnt much point doing these until you are at uni.) the CSP (chartered Society of Physiotherapists) will be able to assist you further with courses and how to get into sports specifically.

As i say you will learn the basics of a Musculoskeletal assessment and treatment at university and then other things you will either learn on placements or once in employment or shaddowing a qualified physio.

Definately try and get some work experience both in an outpatients department (whether it be in NHS or a private clinic) and at a sports club shaddowing a physio. It will not only give you the experience and will help confirm your passion for sports physio and it will also get you known. I think a lot of the time with sports physio it is a lot of who you know as well as what you know.

I'm sorry i cant really help out much more than that as i'm still at uni myself and sports isnt an area that i wish to persue however a lot of my friends want to enter this area.

Hope I have been of some help. You will be able to get more help from qualified physios if you get some work experience with a sports physio.

Good luck!!