Yes and no. It would be possible to do but you may find you will get bubbles around the edge of the sticker which will look nasty from the outside.
Personally I would get rid of the Saxo sticker and just have the window tint done

Or...
If you get the window tint done professionally some places tint windows with a spray instead of the usual tinted film, which I guess would work with the sticker still

Might be something to look into.