There is no official " GTA San Andreas Bangla Version " released by Rockstar Games, but a highly anticipated fan-made mod project titled GTA San Andreas Bangla is being developed by groups like 76GamingBD Key Project Details Developers
Use a file manager (like ZArchiver) to move the OBB/Data folder to Internal Storage > Android > data (or obb ).
Most mods require you to have the base game engine already compatible with your Android version.