A case for the sd card could solve the problem (as Willeke suggested), but would require keeping track of it while using the sd card and putting the card back in each time.
Keeping it permanently plugged into the computer could work (as Zeiss Ikon suggested), but would require the laptop to have the proper port, and may fall out.
Now for my solution, use a device like this (not necessary the same brand):
A small rubber band tightly wrapped around could help hold the card.
It is not very clear from the image, but it has a loop in the end to which a string can be attached. The device is called a "USB 2.0 SD/MMC Memory Card Reader", and the web page I found it on is http://www.bestbuy.com/site/insignia-usb-2-0-sd-mmc-memory-card-reader-black/3602009.p?skuId=3602009