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The Molineux outfit were in pole position for the midfielder's signature before it became public knowledge the Aston Villa man was moving on.
Sidwell ended up signing for rivals Fulham and McCarthy felt the early release of sensitive information meant they missed out on his signature.
McCarthy accepts he cannot ban the social network media completely, but he wants his players more educated on the effect of their usage.
Trouble
"Transfer targets of any sort, I wouldn't discuss them. I think what really should highlight that is we had Steve Sidwell at the Chelsea game here last season," said McCarthy.
"Some twit tweeted it and it became common knowledge. Steve is on the running machine here and having a fitness test the following day and his agent gets a call from Mark Hughes and he goes and signs for Fulham.
"Now do you think that had anything to do with the grapevine or that Twitter line? I think it probably did."
McCarthy added: "Players are going to get themselves into trouble over Twitter, I can tell. I can't ban it and I'm not going to try. I've had that discussion today.
"You can't ban it. How can you? You try and make a rule like that and it just doesn't work. But they have to be careful what they say on it though, about the club and its policies.
"If they put a team selection up, which I'm sure some disgruntled numpty will at some stage, they will be in trouble for it. I think they can get fined for discussing that sort of thing.
"It is forbidden and I think it's unforgivable anyway. We are in the process of educating them, having a media law firm coming in to speak to the players about it."