Johnson's deal at the League Two outfit expired at the end of last season, but after agreeing terms on a two-year contract, the Grenada international has insisted that he is happy to be staying with the club until 2015.
The 32-year-old told the club's official website: "It was quite a drawn-out process but it's all sorted and it's nice to be back.
"I've come in on Monday and everything was normal, a few of the lads were even happy to see me!"
He added: "I just want a pre-season and the fitness it brings under my belt so I'm ready for the first game of the season."
Johnson arrived at Wycombe from Gillingham in 2007.