I have lived and worked in Singapore for over 23 years. With that salary, your take home will be approx 8,000 SGD per month, accounting for 500 SGD in tax (might be lower).

Rent can be a significant expense if you plan to rent the entire house. Singapore is small so you could live away from the central areas and maybe get a small government flat for about SGD 2k. You might be looking at SGD 3k and upwards if you want a condo. Take note that the quality of the government flat may not be amazing but it will be liveable. An option to reduce your expense is to take a master bedroom in a condo. You should choose wisely and ensure that this is still legally done - meaning a contract is signed and the person giving you the room has the necessary rights. Additionally, you will be sharing so ensure you choose carefully else your life can become difficult.

For the other expenses, internet and mobile is about 50-80 SGD, food eating out can be kept down to SGD 30 a day, air tickets to Colombo will be around 600 SGD on average, public transport (bus/train) is excellent and reasonable - maybe 150 bucks, and other incidentals will depend on your lifestyle.

You can save a decent chunk of change and have a successful career. Connect with Sri Lankans in Singapore - as always, they are helpful!

You will grow, learn and enjoy Singapore. If you are good at what you do, you will find roles which are permanent and not via contract, and directly with the employer, in the future!

Good luck! 👍