Paris Dining on Sunday and Mondays nights???
Parigi's link will give you lots of great leads.
"seems all the good places are closed". Bof! Certainly it's inconvenient for visitors here for just a few days but, as a local, I find that Sunday and Monday closures are not that big of a deal. There is such breadth and depth to the Paris restaurant scene that you can always find an excellent meal 7/7. I actually find Saturday much more problematic because all my favourite restaurants are booked solid or so frantically busy that service and cuisine suffer.