Singapore is well equipeed to deal with the needs of expat children and you'll find an overwhelming number of options available.
How old are your kids? How long do you plan on staying in Singapore? These are the type of questions you'll have to factor in when choosing a school.
Also remember that many schools in Singapore are oversubscribed, especially international schools so I'd advise you to start the application process asap.
When I was choosing schools for my kids last year, I found this Singapore Schools Guide really useful.