Yes, you can. You can sell it outright or enter a Licensing Agreement to have another company manufacture your product. Researching the market and competition may help you determine the value of your patent.
Selling your patent outright
If you sell your patent, you sell all rights to the invention. Some inventors do this if they don't want to run a business and would rather go on to invent new products. It's often a one-time purchase.
Licensing your product
If you sign a Licensing Agreement, you are allowing another business to manufacture, distribute, market or sell your product in exchange for royalty payments.