SQL & PL/SQL :: Disconnect And Connect Sql Prompt In Loop Using Script File?

I want to disconnect and connect sql prompt in loop using script file.But whenever I try to do this it is giving error,check the below code.I save below code into some file and call that file using @"filename.sql", it won't work.

Basically I want to run one procedure in loop, and in each loop counter I want to disconnect the session and connect again. Becaue CONN and DISC not working while calling through @"..."

DECLARE
BEGIN
FOR N IN 1..5 LOOP
DISC
CONN SCOTT/TIGER@TEST;
EXEC MY_PROC;
END LOOP;
END;