How to change the dbo name

I am trying to change the dbo name. The following code doesnot work.

Right now the table name looks like this

Sortdate (bank/rsing)

I want it to look like

Sortdate (dbo)

the following does not work

exec sp_changeobjectowner 'sortdate', 'dbo'

Can any one correct me, how to change the owner name.

Thanks