1, OFFLINE the tablespace which has the files you want to move.

Ex. Alter tablespace tbs_data offline immediate ;
Alter tablespace tbs_indx offline immediate ;

Copy the files to the new disk, using OS copy.

2, IF you change the filename (say Drive letter or mount point has changed) while copying to the new disk, do the following

Ex. Alter tablespace tbs_data rename datafile "original_file_name" to "new_file_name" ;

3, Bring the tablespace online.

Ex. Alter tablespace tbs_data online ;