Modir-Roosta replaced Miodrag Jesic at the Tabriz-based football team.
Former Iran striker began his coaching career at Paykan in 2008 then left the team to take charge of Pas one year later.
Modir-Roosta joined Shahrdari for the rest of the season for an undisclosed fee.
Shahrdari is 13th in Iran Professional Football standings table with 20 points.