Change data file name or location in oracle

First take the tablespace offline

alter tablespace "HMA_TM_PROD_GEN2_DATA" offline normal

Copy or mv the datafile or rename it

mv -i /oracle/oradata1/hma_tm_prod_gen2_data_03.dbf /oracle/oradata1/shsub/hma_tm_prod_gen2_data_03.dbf

Bring the tablespace back online
alter tablespace "HMA_TM_PROD_GEN2_DATA" online

Enjoy!