It's been suggested the France winger could be unsettled by Sane's potential arrival this summer.
But Coman told BILD: "He is a really good player and it is only normal for Bayern to pick up a player like him.
"When I came to Bavaria, the club had Franck Ribery, Arjen Robben, Douglas Costa and myself. I was still young and the legends Ribery and Robben were ahead of me and that proves that competition is not a problem for me.
"It is best for the team if there are a lot of good players here and it is not a problem if Sané comes, unless the club tells me that there is no need for me anymore. But the situation with Sané has nothing to do with my future."