expired Singapore to Colombo, Sri Lanka & Gan $512 or Malé, Addu Atoll (Maldives) $545 Return Via SriLankan Airlines
Similar to this deal, SriLankan Airlines is offering 2 in 1 flights to Colombo, Sri Lanka & Gan, Addu Atoll, Maldives or Male for $512 return. These flights include bags, food etc. Normal fares for these flights are around ~$800.
Male Itinerary $545
So basically fly to Colombo and stay there for a week, fly to Gan or Malé, stay there for a week, and then fly back to Singapore.
Use Google Flights to find dates that match up with what you want. It's a bit tricky as you'll have to move both dates in combination to find the fares.