How to convert SQL Server database file to MongoDB?
You could also make use of the OOP paradigm; you could then write a simple program, that will basically do the following.


create Classes for each of your SQL Server relations
create your MongoDB structure acording to those models
load the data into objects
insert it into Mongo


This solution could be feasable or not, depending on your DB's size/structure. That should do it. A straight-forward one-click solution I don't think there's available.