Don't think that is possible, at least not for the table object (if you need it for display only, maybe you should create a report thereof).
But there are other possibilities to structure the table,
of course you can group columns (in the column panel of the table),
and probably "Recode Column Names" may help you to restructure the Table.
Recode Data in a Column (jmp.com)
Additionally you can hide and exclude columns as well ...
Georg