The next big change to the school came with the construction of the Stephen Hawking Building (named after physicist Stephen Hawking), and the swimming pool became an indoor one with the Sports Block being built on top of it, allowing for year-round swimming lessons.

The IB Centre was opened, a section of the school designated for International Baccalaureate students in Years 12 and 13.

The library in the C Block was renovated in the summer holidays of 2012 and re-opened in late September the same year, and was renamed as the "Learning Resource Center".

In November 2012, the renovation of the library was completed and was reopened as the Learning Resources Centre (LRC).

[4] In 2016, South Island School adopted the Middle Years Program and the IBCP (career-related) programme.

The IBCP was offered in addition to the IB Diploma programme, which places a greater emphasis on developing vocational skills.

Students and staff walked down to Deep Water Bay Beach for charity and participated in activities commemorating the event, such as a time capsule and an art mural.

Later that October, an exhibition was shown in the Atrium commemorating the school's history,[7] and an alumni gathering was held in Hong Kong.

During Year 7 and 8, all students follow a common curriculum, which includes English, Maths, Science, Chinese, a modern foreign language (French or Spanish), Individuals and Societies, Global Thinking, design, and the arts.

Fields such as Economics, and Business and Management have been consistently popular among South Island School graduates.

[11] In South Island School, students take a selection of IGCSE, GCSE, IBDP or IBCP examinations.

The school has a specialised curriculum that provides for the student's social, emotional, and physical needs with an opportunity to gain qualifications.

In the senior years, there is a focus on academic English for the IGCSE and the IB Diploma programme.

[19] Students have the opportunity to self-study their native language during the IB Diploma programme with school support.

The Sustainability Council, or SusCo in short, are a student group that promotes environmental awareness in South Island School.

Extra-curricular activities at the school include debating, MUN, squash, netball, basketball, football, swimming, chess, tennis, singing, rugby, field hockey, cricket and more.

South Island School competes in various inter-school competitions including: basketball, badminton, sailing, golf, netball, football, rugby, table tennis, bowling, swimming, athletics, cross country, and volleyball.

Students also can participate in the Hong Kong Award for Young People program (HKAYP), as well as engage in various student-led events, such as Nightfest, International Evening, the Innovation Fashion Show, Diwali Night, the ICM yearly fundraiser, SIS Chef etc.

It has two sub-committees, namely Finance & Personnel (FP) and Learning and Professional Development (LPD) both chaired by community representatives.

Among other matters, the FP sub-committee reviews the school's annual budget and recommends acceptance to the full council.

The LPD subcommittee's work is aimed at among other things, curriculum development, teaching methods and examination performance.