The cliffs are located on the west side of state highway 80, between Unwin Lodge and Mount Cook Village.
Specific directions are under each crag if appropriate.
For most of the Sebastopol climbs park at the 3rd pull out on the left after leaving Unwin Lodge (approx 1km). There is a DoC sign there and the main track starts from there, leads across the river bed then splits in various directions.
Alternatively it's about 10-15 mins flat walk from Unwin along the old 4Wd track. This may be impassable after heavy rain.