You can check with the property managers at the place where you bought your timeshare.  This is only effective if they are not still selling new units.  If they are trying to sell new timeshares they will have little incentive to help you sell yours as new sales are much more profitable.

One effective method may be finding a licensed listing broker to attempt to sell your timeshare for you.  If you decide to explore this option, make sure the broker specializes in timeshare properties.  You will need to find out what the commission will be to see if this is cost effective for you.

A really common way for people to sell timeshares is through online listing services.  There are reputable services that charge fair prices.  This can be an effective way to sell your timeshare.  Before enlisting with an online listing service check to make sure that their website gets a good amount of traffic and has fair terms.  You need a lot of traffic to sell your timeshare online.

Another method that many people have found effective in selling their timeshares is using Ebay’s Timeshare Auctions.  Ebay is one of the most visited websites on the internet.  If you are considering listing your timeshare on Ebay, be sure to carefully read their rules and guidelines for timeshare auctions.

You can also do direct advertising yourself.  This will save you on commissions and fees.  There are several places you can advertise your timeshare for sale.  Some people have found Craigslist to be effective.  You can also try placing an ad in your local paper if they have a travel or timeshare section in the real estate section of the paper.  Also look for property for sale websites that have timeshare listings and get a decent amount of traffic. 

I hope the following tips are helpful and answered your question of where can I sell my timeshare.  If you do your research, are realistic, and stay persistent you are very likely to sell your timeshare.