按MAS的Q&A的说法貌似是可以的
12. If I have reached my Individual Limit but have submitted a redemption request, will I be able to apply for new Savings Bonds within the same month to bring my total holdings back to the Individual Limit?
Yes. You can redeem your holdings in SSB and apply for a new bond in the same month, provided you are within your total Individual Limit of S$200,000. However, you must ensure that there is sufficient money in your bank account at the point of application as your redemption proceeds will only be returned to you by the end of the second business day of the following month from when you submitted the redemption application.