From Courchevel Moriond, on foot, go up alongside the Belvédère button lift. Beyond the first residential chalet, take the Route du Belvédère and go down as far as the hairpin bend at Roc Sabal.
You can also go to Roc Sabal directly by car or ski bus:
From Courchevel Moriond, take the Route du Belvédère by car or on the free Ski Bus from Belvédère as far as the hairpin bend in Roc Sabal (the eighth bend you come to on the way up).