The answer depends what you are trying to do.
If you are trying to have them take over your mortgage payments. It can be done if your lender allows assumption of your mortgage. Your lender can tell you if your loan allows this.
If you are trying to have this individual be your new lender. This can be done by having them payoff your existing loan. You can then make payments to this individual instead of your bank.
Please fell free to call me directly if you have any questions,631-944-8829.