Does IPad Pro 11 have a SIM card

There are 2 models. The Wifi-only mode, and the Wifi +cellular model.

The Wifi+Cellular model has a space for a sim card, it does not include one however.

If you want to use cellular on it, you need to get a sim card from your carrier of choice with service, and then insert it into the sim card tray, and insert the sim card tray into the iPad.

The Wifi-only model, does not have a trya nor slot for a sim card.

Are you using cellular service with it? i.e do you have internet on it when away from wifi?

If the answer is no, then you have no sim card to remove.

If the answer is yes, then you may have a sim card to remove.

See here for how to remove it: Remove or switch the SIM card in your iPhone or iPad - Apple Support

Your signature says you have the iPad Pro 11" WiFi+Cellular. You are better off with removing the SIM Card before having it serviced / replaced, you don't wanna lose your SIM card. A replacement from your cellular provider may cost you.

Only the Cellular version features a SIM card tray. You have to have a SIM card, it's not included.