Can Stepfather Sponsor me to get my U.S Permanent Residency?

Yes, as long are your mother and step father get married before you turn 18 years he can petition you. If he is a U.S. citizen and you were admitted and inspected then you can file for adjustment of status in the US. If you were not admitted and inspected then you will have to visa process outside the U.S. If this is the case you need to see an immigration attorney to advise you how to avoid triggering the 3 or 10 year bar to returning to the US.