Minns takes up the role of head of policy development at the end of this month, reporting to chief executive John McVay.
A Pact spokeswoman said his brief would be to lobby on a number of fronts to promote the sector's commercial interests.
These include negotiating terms of trade with broadcasters and encouraging 'creative clusters' of talent in regions of the UK by strengthening relationships with regional development agencies. He will also be expected to promote the importance of a vibrant independent arts scene to the Department of Culture, Media and Sport.
Minns leaves Screen International after seven years, during which time he has risen from reporter to his present role as UK film editor.
Pact's members include the firms Tiger Aspect, Shed Productions and Touch Productions.
Minns replaces Tim Wilson, who has held the role for the past two and a half years and is understood to be seeking a return to a political consultancy, having previously worked at agency Westminster Strategy.