Yes, we exactly pronounce "ㄹ" sound as in "하실 수".
"하시다" is a honorific form of "하다(to do)".
"할 수 있다" is kinda conjugated form of "하다" indicating one's ability.
so we can say,
"하다" - "할 수 있다"
"하시다" - "하실 수 있다"
"먹다" - "먹을 수 있다"
"드시다(honorific form of 먹다)" - "드실 수 있다"