Board Thread:General Discussion/@comment-79.160.190.167-20130802230901/@comment-11276487-20140419171852

86.165.235.164 wrote: SPOILER ALERT After you've defeated Alduin in Sovngarde Tsun says that you will always be welcome to return.

He says this regardless of the Dragonborn's race or faction allegiances, so it's safe to guess this means you get into Sovngarde no matter what. He might of earned because of Alduins defeat.