there is already a thread on here for this question.but yes any sandy beach is good..look for holes in the sand with a bit of disturbed/dug out sand around the entrance..they will usually be in groups..you can then dig them out or use a bait pump..i personally find it easier just to get them out of rockpools in the dark.
Ive found they are a ways from the Mac mouth on the south side ….assuming the same on the north …. Maybe they don’t like the fresher water ? …. Walk out at low tide and suck sand from the little mounds ….