Any form of realm-traveling requires the separation of one or more of your astral bodies from your physical, which is what Astral Projection is, so you kind find different techniques that go by different names, but it's essentially the same thing.
depending on what you mean, you could use guided meditation, or go into a deeper state of meditation. you might not visit the astral, but you could do a self life regression, or see visions of the future. you should practice projection though if you're interested in visiting other planes. it's hard for most, but it's worth it if that's what you hope to achieve.