The shared pathway at the area known as The Boneyard at Kiama Downs will be closed for the immediate future, following a landslip in the area.
The landslip, which occurred in late April, was on RailCorp land.
RailCorp advised Kiama council it had engaged a geotechnical engineer who was developing a design to address the landslip.
"RailCorp has advised that the design is expected to take several months to complete and that it will keep council informed on progress," a Kiama council spokeswoman said. "The pathway will remain closed until remediation works are completed."