How do you get baby to sleep for naps?

My LO is 1 year old, and I have always nursed him to sleep for naps. My mom can get him to sleep by bouncing, but he will not fall asleep if I don’t nurse him. He will scream for 30 minutes straight and it’s so sad, so I always end up nursing him and he falls asleep. What do I do? I have to stop if I ever want him to wean himself. TIA!