Suyamvaram is directed by a host of directors.Kuselan (Vijayakumar) and Suseela (Manjula) have 9 children: 3 boys (Satyaraj, Prabhu and Abbas) and 6 girls (Rambha, Roja, Kasturi, Maheswari, Preitha and Suvalakshmi). Parthiban is the family's loyal servant but he is treated as one of their own and Napolean is the family doctor.
The movie opens with Kuselan's 60th birthday celebrations and Kuselan gets a heart attack. At the hospital, the family is informed that Kuselan will not live long and to keep him comfortable in his last days. From the devastated family, Kuselan asks for one last favour: that all his children get married before he dies. The children all agree and a state wide ad is put out saying that those chosen to marry Kuselan's children would get a piece of the family properties and 1 crore in cash. Needless to say, the mention of wealth brings in potential brides and grooms by the truck full to be interviewed by either Bhagyaraj and Oorvasi or the two doctors Janakaraj and Senthil.
The parents and Napolean are happy thinking that everything would happen as planned but there is a major hitch that they didn't know about. Most of the children have already fallen in love. Satyaraj, Prabhu and Abbas have fallen love with Kushboo, Aishwarya and Heera respectively while Roja, Kasturi, Maheswari and Preeti are in love with Prabhu Deva, Pandiarajan, Vineeth and Livingston respectively. Each of them get their lover ready for the interview and after some hard work (and in the end, some bribing), they are all selected. Rambha is linked with the absent-minded doctor Karthik who shows up at the interview thinking its an interview for a doctor's post in a clinic while Suvalakshmi, who is handicapped, pairs with Parthiban in the end. Mansur Ali Khan, with Vichitra in tow, tries to worm his way in as a groom and when that effort fails, he kidnaps the 9 brides for ransom. Napolean, who receives the ransom call, calls in his friend Assistant Commissioner Arjun for help. How he foils their plans forms the rest of the story.