The changes came just after seven months of forming the central committee through a council meeting.
Alam was a presidium member of the party for a long time.
Syed Abu Zafar Ahmed, who was re-elected general secretary in the party's congress, has been made a presidium member.
He decided to quit his position due to illness, the party said in a statement on Sunday.
Mujahidul Islam Selim remains president.