how can i remove it? the puller doesnt fit...

do i have to remove the crankshaft itself to remove the sprocket?

the haynes manual doesnt say anything, it just says "remove the sprocket"....

cheers

The front pulley (alternator drive) will need a pulley if an injection engine. Once this is removed then the cambelt drive cog does come off but usually needs a little persuasion with some wedges from behind/the side ( a very thin flat chisel or a medium screw driver.).
Hope this helps.