– as @jonas Grumby suggested, wrapping the ‘get_sidebar()’ code into a conditional statement might work;
– or creating a page template for that one page should work as well; http://codex.wordpress.org/Pages#Page_Templates
just start with a copy of page.php and remove the sidebar code;
the rest is formatting to stretch the content over the full width; for which you might be able to use the body_class output to target some specific css.
as you are using a commercial theme, please contact the theme’s seller for support.