Redweek.com has rentals for most resorts. Whether or not there are active listings there for your resort, Google the name of the resort (in quotes) along with other terms that might bring up rental listings, such as rent, rental, week and/or timeshare.
Also, be sure to note that if this is a week you obtained through an II or RCI exchange, you run some serious risks if you try to rent the week, as it would violate their clearly written policies. You wouldn't want to be in the difficult legal situation that would arise if your renters showed up to check in and were turned away because the exchange company had found out about the rental and cancelled the reservation.