Lindsay-Davies will work through a handover period before leaving Freesat and will take up his new role in October.
He joined Freesat as commercial development director in December 2007.
Professor David Youlton, chairman of the DTG, believes that the time spent away from the group while working on the launch of Freesat will be beneficial to Lindsay-Davies in his second spell in the job.
“The broadcasting experience he has gained at Freesat and the expertise he will have acquired from taking part in such a high-profile platform launch will only enhance the outstanding range of skills that made his original tenure with the DTG so successful,” he said.
Lindsay-Davies initially joined the DTG in 2004 as director of public affairs and was appointed director general in August 2006.
Prior to joining the DTG, he was head of strategic marketing at Pace Micro Technology. He has also worked for Sony and Toshiba.
Dermot Nolan left the DTG in June after just six months in the job. No reason was given for his departure.
The DTG is the industry association for digital television in the UK. It represents the interests of broadcasters and manufacturers.