A planned pro-Palestine march set to end at the Sydney Opera House has been scuppered after a court ruled the risk to public safety was too great.

The decision on Thursday, which allows officers to move on or arrest those in the iconic landmark's forecourt, comes after NSW Police challenged the Palestine Action Group's proposed protest in the NSW Court of Appeal.

The organisers are now pivoting to a new location after estimating about 40,000 people would have joined the march through Sydney's city centre to the steps of the famed waterside landmark.

Justice Stephen Free said a protest of that size would have "given rise to a risk of crowd crush", which was the unanimous view of the court, he said.

The appeal court judges pointed to the "exceptional risks associated with the particular

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