Club and player have been locked in talks since the end of last season.
But Bromley have today confirmed he has signed on for the new season.
Manager Neil Smith says the 35-year-old former Birmingham and Wolves centre-half is a big asset for the club.
He told the club’s website: “Roger came in at a difficult time last year, but his experience is immense and it really helped us.
“With a relatively young squad, it’s important to have someone like Roger around and he’s always a pleasure to work with.
“The players have and will continue to learn from him.”
Johnson said: “I’m glad to get the deal done. It’s been a long process, pretty much since the end of the season.
“We can just move forward now and I can focus on getting fit and being ready for the new season.”