There are two Buffalo Wild Wings in Knoxville, see below.
The one on Cumberland is on 'the strip' adjacent to University of Tennessee.
You should be able to watch the Sabres at one of those two locations.
Buffalo Wild Wings Grill & Bar -
1912 Cumberland Avenue, Knoxville - (865) 524-9464
11431 Parkside Drive, Knoxville - (865) 966-7300
Also, the bartenders at Calhoun's On The River (behind Neyland Stadium) are usually pretty good at letting customers choose a game to watch.
Enjoy your trip to Knoxville!