You cannot travel through normal space with magick so if the theory of multiple dimensions or alternate realities is reflective of the truth magick won't get you there. Theoretically one might label the astral plane as another dimension so you might be able to travel to these places via astral project but creating a wormhole or bridge to another dimension is beyond the capabilities of science & magick at this point in time.
Re: Dimension Jumping Spell.
By: AstralAsh Oct 16, 2015
Post # 3
What they said. ^^
If you are still interested in travelling to other dimensions, look up 'Dimension Jumping Reddit." It's a Reddit dedicated to dimensional jumping. There are guides, tips, and those experienced in DJing that you can talk to.