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. Similarly Q* could give Quality module related tcodes.
Hope you followed what I said. In SE11 table Contents (selection-screen) you give the prefix of tcode (which usually identifies the Moduel) followed by * (wildcard search) 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