No, you can only get the visa once you have a company willing to sponsor for it. For internships in US, you can apply for J-1 visa* which is an internship visa

No, you can only get the visa once you have a company willing to sponsor for it. For internships in US, you can apply for J-1 visa* which is an internship visa and it will require you to create a learning plan with the company that decides to hire you. * IANAL and it might depend on the country you are from. I'm from Finland and had my internship under J-1 visa in 2014 in Silicon Valley startup.