Looking for Work in Professional Sport/Sports Injury Clinic in USA

Hi guys,
I am an Irish-trained and based physiotherapist looking to find out more information re working in Sports Medicine in the USA.
I have worked previously in professional rugby in Ireland but due to the rare opportunities existing in this field in my country, I am looking to seek out other overseas avenues of getting experience in the area.
I would be grateful of anyone who may have some advice in getting me started...e.g. agencies that deal with this field

All the best,

Irish Physio