If you want to move the table to new file group use the following one
Go to the Design mode of the table in the Enterprise manager and change the table Filegroup value to the required one.
If you want to move the entire file to new file group, I am not sure is there any direct approach but here is a good doc to move several file groups to one which will sit to your req with few modifications
http://www.sqlservercentral.com/columnists/cmiller/gettingridofexcessfilesandfilegroups.asp