SQL Server 2008 Client Tools Installation
Run the setup program from the installation media to load the SQL Server Installation Center.
Once the SQL Server Installation Center loads navigate to the 'Installation' option and select the 'New SQL Server stand-alone installation or add features to an existing installation' option.
For the sake of brevity, once you being the installation process the Feature Selection screen is where you have the option to just install the client tools as shown below.
As you complete the process you will be able to confirm your selections by reviewing the options in the Ready to Install screen as shown below.
In this circumstance, the tools are installed in the C:\Program Files\Microsoft SQL Server\ directory. The tools can also be accessed by navigating to Start | All Programs | Microsoft SQL Server 2008.