Johnson has senior leadership experience in the commercial sports and media sector, currently serving as chair of the Rugby Football League and also a non-executive director at chartered accountancy firm HW Fisher.
Prior to this, Johnson had a spell as director of corporate affairs and company secretary at the English Football Association, and as chief operating officer for England’s 2018 World Cup bid.
Johnson also spent time as chief executive of Business in Sport & Leisure, as well as director of rights and business affairs at ITV, and chief executive of The Jewish Leadership Council.
“I’m very pleased to be joining SIS, one of the industry’s most recognisable and trusted brands,” Johnson said.
“SIS has made great strides in extending its presence around the world through quality and engaging products.”
SIS chief executive Richard Ames added: “The appointment of Simon is most welcome and follows the successful globalisation of SIS in recent years.
“Simon has extensive experience in working for some of the leisure industry’s biggest bodies and his leadership qualities will prove invaluable to SIS. We are now in an even stronger position to build on our recent momentum and further grow the company’s position within the global betting industry.”