American Football NCAA Rule 9-2-5

While the ball is alive and during the continuing action after the ball has been declared dead:
a. Coaches, substitutes and authorized attendants in the team area must be behind the coaching line.
PENALTY—Administer as a dead-ball foul. First infraction: Warning for sideline interference. No yardage penalty. [S15] Second and third infractions: Delay of game for sideline interference, five yards from the succeeding spot. [S21 and S29] Fourth and subsequent infractions: Team unsportsmanlike conduct for sideline interference, 15 yards from the succeeding spot. Automatic first down for fouls by Team B if not in conflict with other rules. [S27 and S29]
b. Physical interference with an official is a foul charged to the team for unsportsmanlike conduct. (A.R. 9-2-5-I)
PENALTY—Team unsportsmanlike conduct. Administer as a dead-ball foul. 15 yards from the succeeding spot. Automatic first down for fouls by Team B if not in conflict with other rules.[S27]