Is it possible to return to Skuldafn?
Is there anyway to get back to Skuldafn once completing that quest without using a console command (since I'm on the Xbox 360 version)?
It's not possible on a console, but you may be able to transfer the Xbox save to a PC and teleport yourself there via the developer console with
coc Skuldafn01, then move the save back to the Xbox. You may have to use that method again to get back to Tamriel.