No special access issues
You have to drive all arond the caves from Domusnovas and follow the road to the very end. Just 100 metres before the northern entrance of the cave you'll see a path on the left, climbing up the slope. Follow the path for 10 minutes, paying attention to your right side where the crag is located.
The path eventually ends inside the cave that was equipped with the sector "Tana delle Tigri", make sure you turn right before that