Team Wales Director of Operations and former Wales international, David Evans, said: "Robin has demonstrated his extraordinary talent during his rugby career to date and Robin will be a real asset to the sevens team when it takes to the field next month.
"We are disappointed to lose Lee from the Team Wales line-up for the Melbourne games but we wish him a speedy recovery and best wishes for the remainder of his season with the Opsreys."
Wales Sevens will face a tough challenge in the two-day tournament at Melbourne's Telstra Dome on March 16 and 17. They are to take on defending Commonwealth Champions and six-time IRB World Sevens winners New Zealand, Kenya and Namibia in Pool A.
Wales Squad: Richie Pugh (Opsreys), Rhodri Mcatee (Penzance), James Merriman (Gloucester), Jamie Ringer (Newport Gwent Dragons), Robin Sowden-Taylor (Cardiff Blues), Tal Selley (Llanelli Scarlets),Rhys Williams (Cardiff Blues), James Hook (Ospreys), Jonathan Edwards (Llanelli Scarlets), Wayne Evans (Cardiff Blues), Gareth Wyatt (Newport Gwent Dragons), Jonathan Vaughton (Opsreys)