What precaution should we take to change the default page of the site

[CyrilWilson]

For some reason we wanted to change the default page of my site from example.com to example.com/default.aspx. We will be using 301 redirection to get the back link benefits.

Do we need to make any changes in webmaster tool and sitemap too??

[BenFox]

So long as you're staying on the same domain then the 301 should be enough.

[BenFox]

And the sitemap for good measure. And preferably hardcode any internal links that you can to point to the new default.