Here is a workaround, but in means two things:
you will need to insert a new column (but you can hide the one that has the decimal points)
It will convert the numbers into strings so you will not be able to use them for calculations (but they will look right). You will still be able to do any calculations you need using the original data (in the 'hidden' column)
Assuming that the number you want to reformat it in cell A1, then in another cell (e.g. B1), insert the following formula:
=text(A1,"00")&","&right(text(A1,"00.00"),2)

You can also copy and "Paste values only" (Ctrl+Shift+V) so that you can then remove the original column (if you don't need it for calculations)
