Ben Simmons does NOT have a problem with his jumper -- it's a CONFIDENCE issue -- so says NBA and BIG 3 sharp-shooter Joe Johnson, who tells TMZ Sports the Sixers guard will be just fine.
Simmons has struggled to find his rhythm with jump shots since entering the league in 2016 -- most recently, he was criticized for going 35% from the charity stripe and averaging 9.9 points a game in the Eastern Conference semi-finals against the Atlanta Hawks.
Not ideal for a former #1 overall pick ... but Iso Joe -- who's known for his clutch shooting -- isn't worried at all, saying he knows the 25-year-old will find his way.
"I honestly don't think nothing's wrong with it," Johnson tells us. "You see him playing pickup basketball shooting jumpers, fadeaways, threes ... so we all know it's there."
It's true -- Ben put in work with Rajon Rondo earlier this offseason ... where he was recorded on video drilling threes.
"He just has to take that same confidence that he has in pickup and translate it into an NBA game," Johnson adds. "That's it. You're gonna miss and make shots, you can't care about the misses. He's just got to continue to take them."
Johnson says the talent is clearly not the problem ... but when BS takes the court, he's got to remember that he's that dude.
Joe makes it sound easy ... but all eyes will be on Ben to see if he can find his flow once next season comes.