There were 34 Conservatives who voted against May's last attempt (that was put to a vote) on March 29 to pass the Withdrawal Agreement she agreed with EU.
I recognized only one remainer on that list: Dominic Grieve. Are there any other?
It all depends on what you mean by remainer, several pro-Brexit MPs have been labelled Remainers for voting FOR May's deal.
That said, the most succinct definition is probably those in favour of a 2nd Referendum. The list on the FT article on Conservative Tribes is a little out of date as it comes from before the creation of The Independent Group, now known as Change UK.
Still sticking with that list, all of them voted against the Government and they are;
The rest of the listed Tribe defected to the new Change UK where they also voted No in this instance.
So in a direct answer; 6 Remainer Conservative MPs voted against May's deal in Meaningful vote 3.