Although I would have thought intentional grounding applies to any player, the 2013 NCAA rule book makes no mention of any player, other than the QB. The closest thing to a definition is found as follows:
SECTION 3. Forward Pass
Illegal Forward PassARTICLE 2
Approved Ruling 7-3-2
I. Quarterback A10, who is not outside the tackle box and is attempting to save yardage, intentionally throws a desperation forward pass that falls incomplete where there is no eligible Team A receiver.
RULING:
Intentional grounding. PenaltyLoss of down at the spot of the foul. The clock starts on the snap (Rule 3-3-2-d-4) unless Rule 3-4-4 applies.
All other references to "intentional" or "intentionally", with respect to grounding, specifically cite the QB as the offender. If the NCAA intended it to apply to all players, you would think they would have said "player" rather than "quarterback."