The card says you may discard it to make your opponent return their card to their hand. If you do return to the command card step. So the question is do both of us draw new cards or do I get the token for Han and 2 units on the “Change of Plans” that I discarded and my opponent have to draw a new card?

Thanks!

You both select new cards and you don’t get to issue any commands associated with Change of Plans. Because you discard CoP and return to the Select Command Card step before any commands are issued.