I am guessing you mean to sponsor you to travel abroad. Strangers cannot sponsor you. It has to be someone who can speak of your character and why you are traveling. In some cases where work is related, they have to prove they need to hire from outside the country. Please check with your countries consulate to get more details on what specifics are needed. Do you mean some other type of sponsorship?
To get sponsors, you need to check out with your school's financial aid and scholarship office since they are in a position of helping get one. You can search for sponsors from school lists found at neighboring colleges and universities, and at your city and state buildings. Go to http://www.ehow.com/how_5391843_sponsors-sponsored.html for reference.