Question
During an out-of-body experience, where is the soul- within the body or outside of the body?
Is there some scriptural proof that out-of-body experiences are within the mind?
Answer

The mind, not the soul, leaves the body.
We know that the body can only live as long as the soul is there. So the soul cannot leave. Shastra often speaks of something moving at ‘the speed of the mind.’ So we know the mind travels.