Definition of sandbag
Playing a hand in sandbag is playing a very strong hand passively. Sometimes you have to play your good hands aggressively. Like when there are several draws in flop or when there are several players involved in the hand. But when your hand is too strong and there are no draws, playing your hand in sandbag is the right thing to do. Imagine that you have 88 in hand on 8-8-2. Here, no straight draw, no flush draw, and no reason to believe that a player could have an overpair. This is a good situation to play passively.
When to play and not play your hand in sandbag?
There are several variables to consider when it is a good time to play your hand in sandbag. The worst time will be on a flop with multiple draws when you are several players on flop. Imagine that you have 88, but on a flop KJ8 with a flush draw and you are 4 players on flop. Here, you need to play aggressively. Players with pairs and draws will call you. The right time to play your hand in sandbag is when you are face to face on flop, flop offers no draw and your hand is super strong.