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wouldnt use sharp sand unless ur soil is sand based as u will create a root
break.
Brush or rake the worm casts off before cutting . Sounds like u need a good
spike on the lawn then a feed or a dose of iron will help regain the
greeness of the grass.
If the worms are a problem apply some lime to deter the worms or ask ur
local golf/bowling greenkeeper if he can spray fungicide which is also a
worm deterent.[/quote]

I don't often actively disagree with other's advice, but what Pied Piper has written is rubbish. Sharp sand doesn't break roots - it improves drainage and I've done the fork/wiggle/sharp sand combo on all sorts of soils, including clay. If drainage is improved the worms will be less likely to come to the surface and leave casts. No-one in their right mind would use fungicide to kill worms in their garden (even supposing it works).