Wenger left Sanchez out of March's game at Liverpool following a training ground bust-up involving the forward and team-mates, and Pardew "absolutely" advocated similar action again if the current situation was the same.
Pardew said, "There are situations where players force the hand of the group.
"Virgil Van Dijk has done that at Southampton. He wasn't playing, not picked every week – a great player like him. You have to question the attitude of him and look at all the other players.
"If we were a team in the room and we had one player doing that I would expect the group not to accept that. I would expect a manager to respond to the group.
"They either react to it in an understanding way, or they don't, and sometimes it gets a bit more volatile than that. Sometimes those moments are from a group rather than a manager themselves."