The 22-year-old cut in from the right and fired a shot into the far top corner from 20 yards for his first England goal.
Ruben Loftus-Cheek gave England a tenth-minute lead, before March got the second five minutes later. Cauley Woodrow made it 3-0 just past the hour, before Loftus-Cheek got his second after 69 minutes.
March was an unused substitute in England's 1-0 defeat to Germany on Friday, while Seagulls team-mate, goalkeeper Christian Walton, was also in the squad.
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