If you generally run these sql scripts form one machine, you could alter your registry for SQLPATH:

HKEY_LOCAL_MACHINE\SOFTWARE\Oracle\(your oracle home)
open the SQLPATH and enter the folder locations, separated by a semicolon:
example - "c:\new_directry1;c:\new_directry2;c:\new_directry3;c:\new_directry4"

after updating your SQLPATH key, you will be able to type "@(name of sql script).sql" from sqlplus prompt and it will iterate through the directories in the registry path and run the first script it finds with that name.