DECLARE
  cursor c_index IS
    SELECT index_name
    FROM   all_indexes
    WHERE  tablespace_name = '<stuff>';
BEGIN
  FOR rec IN c_index LOOP
    EXECUTE IMMEDIATE 'alter index '||rec.index_name||' rebuild tablespace <new tablespace>';

  END LOOP;
END;

DECLARE
  cursor c_table IS
    SELECT table_name
    FROM   all_tables
    WHERE  tablespace_name = '<stuff>';

  cursor c_index (p_table  in  varchar2) is
    SELECT index_name
    FROM   all_indexes
    WHERE  table_name = p_table;
BEGIN
  FOR rec IN c_table LOOP
    EXECUTE IMMEDIATE 'alter table '||rec.table_name||' move tablespace <new tablespace>';

    FOR idx_Rec in c_index(rec.table_name) LOOP
      EXECUTE IMMEDIATE 'alter index '||idx_rec.index_name||' rebuild';
    END LOOP
  END LOOP;
END;