The Black Cats were hit with a fine for failing to register Ji Dong-won once he had returned from a loan spell in Germany.
Poyet was manager of Brighton & Hove Albion when a similar thing happened against them in 2010. In that case Hartlepool United were docked three points.
"I'm not saying we should have been docked points," Poyet told reporters. "But I would understand if we had.
"It's incredible. The rules should be clear. It should be one rule, for me or against me. I am not a hypocrite."