Hey,
That makes a bit more sense now. Most people find veterinary nurse/assistant/tech jobs via their local newspaper or simply by calling clinics they are interested in working at in their local area to see if they have job openings.
As a side note nurse/tech titles usually means that a person has formal education/certification for nursing/technician, assistants are usually on-the-job trained -- each state varies on actual jobs each can perform. You would have to look into each state you are interested in as to what they will recognize your level of education even though you are a qualified vet in India.
I don't know your current financial situation but if you were looking for a sponsor to help you come to the US, it is unlikely that a company would sponsor someone as a veterinary assistant/nurse/tech -- these are lower-pay jobs in the US and the job market is horrible right now in general.
So all that said, finding a job is probably a matter of calling clinics and sending out a curriculum vitae and cover letter explaining your situation and interest in the city/town you wish to work in the US.
Good luck