What are the education requirements to be a substitute teacher in Pennsylvania?

You would qualify at a private school now. However, in all states a BA is required to be a teacher. even a substitute teacher. Now if you live in an area where substitute teachers are in need, the school district could get you a waiver to allow you to substitute. This is rarely done when there are so many credentialed teachers out of work. Start working on that credential now. The only other alternative is to get a job as an aide which does not require more education. Good luck!