The only way to add something after you’ve filed — and the IRS has accepted your return — is to file an amended return.
If the IRS rejects your return, you can make changes before re-filing.
You may not have to add Form 1099-S if you reported the property sale. If you sold the property and did not report it, then you probably will have to file an amended return to show a gain or loss.
The 1099-S issuer sends a copy to IRS and they will be trying to match the form with a property sale on your return.
Wait until you receive your refund before doing anything in case the IRS corrects your return.
See How to Correct Federal Tax Returns and How do I amend my federal tax return for this year?
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