Kevin George will act as head coach with additional support from staff of the performance department.
"The Wales U19 development side provides a watching brief for U20 selection," explained WRU head of rugby Joe Lydon.
"It was recognised that another vehicle was needed to assess these players who may have only had a short window to represent Wales at U18 level and it was decided that the U20 selectors needed to see these players play at a higher level giving a view of the depth that is out there.
"Those that are U18 capped can show themselves as potential U20 players of the future. Our counterparts also see this side as a valuable platform, unearthing additional players for U20 for this year and next, that may have ordinarily slipped through the net."