Hello Siti,
To my understanding module has not been a field any where in tables. Only way is to assess through the pre-fixes, lie IW* will give all tcodes strting with IW which relate to basic functions PM module. Similarly IK* tcodes give to other functions of PM but here there are other modules who use these tcodes. The basic ERP function being integration across modules you can not draw a line between tcodes and say that they belong to this module. But by-and-large, we can have the information through the search through Prefixes. Similarly search of MB* gives to all Goods movement related tcodes and these we can say belong to MM module.
Hope you followed what I said. In SE11 table selection screen you give the prefix of tcode follwed by * and execute, you get all the tcodes in this area. You can then download and compile your own list of Module vs tcode as per your knowledge.
Regards
KJogeswaraRao