Unfortunately no, there isn't. It's available in Debian Jessie (testing) only at this point.
If you really need apache 2.4 I would recommend using jessie altogether for your machine's distribution instead of squeeze if possible to avoid having a mixed sources environment which would put you in a less-commonly used and less supported configuration.
Otherwise if there is a specific reason that makes you want to use 2.4 perhaps there's a workaround to update your php files or other to make it work in apache 2.2 and stay on squeeze.
But if you really want to go into a mixed sources environment it's possible using apt pinning, that will involve 2 steps:
- Adding sources of jessie to your /etc/apt/sources.list
- Adding a pinning preference in /etc/apt/preferences
Here's more information about it: https://wiki.debian.org/AptPreferences
Note that you might be faced with new apt dependency issues as your machine updates evolve and you install apache modules with mixed dependencies to 2.2 or 2.4. If it's an acceptable complication for your needs you could go ahead with it.