A list of Approved Foreign Part 145 companies is at:
http://www.easa.eu.int/approvals-and...A_Part_145.pdf
It seems there are no US Companies on the list!
Regarding working on a US student visa, I suggest you contact your local US Embassy. You will probably find that if working is allowed, they will expect you to be enrolled full-time on a course (so quite how you expect to get the required two years maintenance experience at the same time will be interesting!)