Tourists would be banned from climbing Uluru in protest over the Northern Territory intervention, a protest rally in Sydney has heard.

Vince Forrester, an elder from the Mutitjulu people who are the traditional owners of the tourist icon, said closing the rock to climbers would highlight the problems caused by the "draconian" intervention plan.

He addressed about 300 people who gathered at The Block, on the CBD's southern edge, before they marched into the city to mark the one-year anniversary of the intervention.