Is there a meditation course to learn body scan?

Yes. Body scan is one of the techniques a Techniques course can be built entirely around, so instead of meeting it once you practise it across the whole course. The sequence starts wide and then narrows: a full sweep through the body first, then the weight of the body and where it meets the floor or chair, then attention resting in the hands and the feet. Guidance stays generous throughout, because you are learning a skill. Body scan suits people who find sitting with the breath difficult, since there is always a clear next step to follow.