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try heating the sprocket if possible with a blowtorch, let it cool then try again. If there's any threadlock then it should weaken it. If that doesn't work try gt85 or another penetrating oil and let it soak in for a while. Still no joy then try the rotafix method. I've had this same problem and it shows how useful a chain whip is that uses an actual bike chain than can be replaced, a lot don't.
Sumo
Buildhigh
trying to get a cog off the track hub, (yes trying to unscrew anti clockwise), gone through 2 chainwhips already, as in the chain deforms and snaps....(can these be repaired?), any other methods? dont want to destroy the hub as its a nice Paul one.