Swimming pools at the NSC will be closed for nine months whilst extensive refurbishment works are carried out.
£4.2 million will be spent updating the competition and leisure pools which are 20 years old.
The facility will close on August 4th and is set to re-open in May next year.
Education, Sports and Culture Minister Graham Cregeen says: "I welcome this significant investment in one of the Island’s key sports facilities which demonstrates government’s commitment to sport.
"The Programme for Government sets out a number of targets around health and wellbeing: such as increasing the number of people regularly undertaking physical exercise, and increasing healthy life expectancy.
"Access to sports facilities plays a key role in realising these ambitions.
"The Island has invested considerably in sport over the past 25 years and we continue to reap rewards from this."
A new zero-depth wet play area will be created as part of the revamp – the changing areas will also be fully refurbished.