Go through the following articles. Let us know if this still doesn't solve your question.

http://www.bidn.com/blogs/KeithHyer/bidn-blog/2465/copy-and-rename-a-file-in-ssis-using-the-file-system-task

http://www.rafael-salas.com/2007/03/ssis-file-system-task-move-and-rename.html