Sure there is. You just put in writing that the house has a contract, but you will continue to show for backup offers only until your receive the mortgage commitment.
i have done this many times, usually till out of attorney review, sometimes until inspection contingency clause has beeen settled, and ocassionally till the mortgage commitment is received.
Bear in mind though, many buyers are not going to waste their time looking at your home while it already has a contract, nor are they willing to wait to see if their "back-up" offer will become the primary offer.
You CAN ask that the buyers get a mortgage pre-approval, rather than a pre-qualification, or even ask that the buyers get pre-approved/qualified through a bank/mortgage broker whom you trust for a little more peace of mind.
Most mortgage commitment dates (at least here in NJ) are in the contract, and are usually 30 days after contract signing, and typically the closing is another 30 days after that, so you should never hear 2 days before closing that the mortgage has been denied.