There are several certifications you can look into such as project management, Lean six sigma, and SCRUM master certification. I recommend researching each one to identify what may fit with the type of internship you are pursuing. If you decide not to pursue a certification, you can also look for an open online course that covers any of those concepts.
Are you asking what majors are applicable? If so, anything Computer Science related is going to give you a nice baseline to help you land an internship.