"There's no substitute for out-and-out pace," said coach Stephen Gemmell. "To have Thom Evans is fantastic."
"Couple that with the likes of Hefin O'Hare and Andrew Turnbull and we've got some of the fastest players in Scotland available."
The Sevens campaign goes to London (23 & 24 May) and Edinburgh (30 & 31 May).
Scotland are in Pool C with Fiji, Kenya and USA in London, while they are up against England, Kenya and Canada on home soil.
Scotland squad to compete in London (23 and 24 May) and Edinburgh (30 and 31 May): Scott Forrest (Ayr) captain, Mike Adamson (Glasgow Warriors), Thom Evans (Glasgow Warriors), Roddy Grant (Edinburgh), Colin Gregor (Glasgow Warriors), Allister Hogg (Edinburgh), John Houston (Edinburgh), Greig Laidlaw (Edinburgh), Hefin O'Hare (Glasgow Warriors), Colin Shaw (Glasgow Warriors), Jim Thompson (Edinburgh), Andrew Turnbull (Edinburgh)