Oracle, Create table with inline constraint declarations using a different tablespace
Like this:

create table THIS_TABLE (
  id number NOT NULL, 
  constraint THIS_TABLE_PK PRIMARY KEY(id) 
             USING INDEX TABLESPACE INDEX_TABLESPACE
) tablespace DATA_TABLESPACE;


USING INDEX TABLESPACE is the syntax - you weren't far off.

As far as good/bad practice is concerned, that's opinion-based, so not really something that should be asked here. The alternative is to use the ALTER TABLE .... syntax after table creation.