Air Traffic Control Fully Certified
Confusion; Communication Breakdown
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Ground Incursion Taxiway
Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach
Airport
Aircraft X was assigned a right turn onto Taxiway A3 after landing roll. Aircraft X turned onto the closed Taxiway A4 instead which resulted in me sending around an air carrier. Shortly after this incident Operations called me to inform me that there was no signage to indicate to pilots where Taxiway A3 was. There are numerous taxiway closures due to construction and this has made our airfield configuration very complex at times. I highly recommend more signage to help out both the controllers and pilots to not get confused. The number one contributing factor was the pilot not having adequate signs to know where he was going.
SBN Local Controller reported an aircraft exited on wrong taxiway; resulting in the Controller sending traffic around.  Reporter was notified that there is a lack of Taxiway A3 signage due to construction.