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Forest season ticket holder, Robert Biggs, 30, was seen on television cameras head-butting Sharp after Forest defeated United on penalties to reach the play-off final.
Sharp, a former Forest loanee, was standing on the touchline amid a pitch invasion from the home fans inside the City Ground before he was knocked to the ground.
Biggs pleaded guilty to assault occasioning actual bodily harm on Thursday at Nottingham Magistrates' Court and was jailed for 24 weeks, while he was given a 10-year football banning order.
Biggs was also ordered pay £500 compensation to Sharp along with £85 in costs and a £128 victim surcharge.
A separate charge of illegally entering the playing surface against Biggs was dropped.