Sanjay,
Here is an askTom article that I think responds to your question. http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:32939838390113
If you're moving the entire database, you may find it easier to rebuild the controlfile. Otherwise, to move the system tablespace, you need to do it at the "mount" stage.