Simba were pegged back shortly after kick off, in which Coastal Union striker, Raizim Hafidh, capitalized on a mistake by the former's defender, Erasto Nyoni, and keeper Aishi Manula.
Nyoni and Manula failed to coordinate well when defending the ball within the area and the Coastal Union striker easily slotted home.
Coastal Union got a free kick 25 meters out on the 11th minute, an opportunity that was though wasted as midfielder Mtenje Juma's effort was saved by Manula.
Simba went close on the 17th minute as defender Nicholas Gyan intercepted a pass by Coastal Union player, picked Emmanuel Okwi with a good cross and the latter's powerful effort was parried by Coastal Union keeper Soud Abdallah.
The hosts got an opportunity to notch a second later in the stanza, only to see forward Haji Ugando fluff a shot from close range.
Forward Meddie Kagere wasted a glorious chance for Simba later as he failed to slot in from within Coastal Union area after he had pounced on the ball inside the box.
The first stanza ended with Coastal Union still 1-0 up.
Simba got a penalty a minute into the second stanza as Okwi, who had raced to an assist by team mate, was fouled by Coast Union keeper Abdallah.
Kagere made no mistake with the spot kick, coolly sending the keeper the wrong way to help Simba notch an equalizer.
Kagere made it 2-1 for Simba on the 67th minute as he raced to a good pass by midfielder Haruna Niyonzima within the area and slotted in.
Simba's technical bench brought in striker Adam Salamba for Okwi midway through the second half, the subtitution however hardly helped Simba notch a goal given the former was ineffective.
Simba wasted several other chances later on in the period that could have seen the outfit record a convincing win.
Simba hung on to the lead for the remainder of the period to ultimately come out with a crucial win.
Simba are placed third in the log. They have recorded 19 victories in 23 matches as well as managing draw in three games and losing one game to collect 60 points.
League leaders Yanga succumbed to a 1-0 loss to Mtibwa Sugar in the league’s other match in Morogoro the same day.
Striker Riffat Hamisi slotted in the only goal which separated the two sides to help Mtibwa record the win and collect 48 points.
The Morogoro squad, presently placed fifth in the league’s log, is level with Iringa’s Lipuli FC. Mtibwa Sugar though have a game in hand as they have played 32 matches.