Sandcastle opened on 26 June 1986 on the site of the former South Shore Open Air Baths as a joint public/private partnership. Operation of the facility was taken back into
Blackpool Council ownership in 2003. A significant investment in new attractions costing £5.5M was also agreed, which was delivered in two phases, with the second opening in 2006 on time and on budget. In 2012, Sandcastle opened two new
Aztec-themed slides, one with a chamber called 'Aztec Falls', and a toboggan-like slide called 'Montazooma'. Sandcastle Waterpark celebrated its 30th birthday in 2016 with a monthlong series of events involving a variety of local charities and community groups. On 26 June 2016 as part of these celebrations, the waterpark regained the world record for most riders (529) down a waterslide in one hour. The previous record had stood to a Dutch waterpark at 396 riders. In 2022, management of the facility was awarded by Blackpool Council to
Merlin Entertainments for a two-year period. By June 2025, Blackpool Council were operating the attraction in-house once again, and in August operation transferred to their new tourism company
Blackpool Tourism Ltd. == Slides and attractions ==