Saadoui, born in Gaafour, in north-western Tunisia, was about four when his family moved to Sousse, which is near to the scene of a 2015 gun attack in Port El Kantaoui.
A gunman targeting a hotel killed 38 people, including 30 Britons.
The 38-year-old, who is understood to hold UK citizenship, was convicted of preparing acts of terrorism between December 2023 and May 2024 alongside Amar Hussein.
Amar Husein has been sentenced to life in prison with a minimum term of 26 years.
Saadoui’s brother Bilel, 36, was found guilty of failing to disclose information about the plans and has been jailed for six years.
Bilel Saadoui also worked in a hotel in Sousse and he too went on to marry an English tourist, a widowed hairdresser on holiday with her two young children.
They met in 2010 and started a relationship a year later before getting married in November 2014 and moving to Hindley, Wigan.
Since 2020 he had worked as a casual worker at Pound Bargains in Market Street, Hindley.