Admission at Netherdale will be free for Tonga's visit
Scotland A will face Tonga at Netherdale, Galashiels, on 20 November, with free admission for spectators.
"This is a really important game for the players to stake a claim," said Scotland attack coach Gregor Townsend.
"We've great strength in depth in a number of positions and it will be fascinating to see our players get that opportunity to play at that level.
"A full Tongan international side is a force to be reckoned with for any team in rugby."
Scotland A, the current IRB Nations Cup champions, last ran out at Netherdale in 2002 when they beat France A 19-13.