Sorry! Fire Token Bumping Rule
I would say yes. The rules state that two pawns can never occupy the same space. Since it is your turn and you advance your pawn with the fire token to the corner, it would make sense to return the opposing player's pawn to start. The only time you wouldn't be able to do this would be if:


There is a pawn with the ice token on the fire corner

One of your pawns is on the fire corner.



Both of these scenarios would involve you not moving your pawn with the fire token to the corner. Otherwise, Sorry! is the name of the game.
The only reason I could see this having an effect would be if you have no other pawns on the board and the card you draw after sending the opposing pawn home is a 4.