No, there is no Sandals discount code.
Although you may see websites that say they offer Sandals discount codes, these are not real. No general Sandals discount code exists.
Instead, everyone is guaranteed the best price at Sandals when they visit the Sandals website. Their online booking platform automatically applies all the current offers available.

Does Sandals give discounts?
Yes, Sandals resorts are always offering discounts including seasonal promotions, 777 deals, and last-minute deals. You can check for these on the Sandals website or by working with a Sandals travel agent.
Sandals also always offers a military discount of 10% that also applies to first responders and FEMA staff.

What time of year are Sandals cheapest?
Sandals resorts are cheapest in the summer months. Be aware that these are also during hurricane season, so if you go then be sure to get travel insurance.