If you mean output synchronised Audio across Sonos and Echo devices, then no this is not possible. If you mean control Sonos via multiple Echo Dot's then yes, this is a standard set-up - Just follow the steps in this article
How Do We Help You Set Up Sonos Voice Control? Our technicians expertly link your Sonos devices to Amazon Alexa or Google Assistant by carefully configuring the Sonos app, granting the necessary permissions, and guiding you through voice command setup.
This set-up is a bit different than the general multi-room, and well cover that as well. Requirements. To set up Multi-room music, you need an Echo Show, Echo, or Echo Dot. This feature is unavailable on Fire TV and Echo Tap, and you cant do it on third-party speakers except for Sonos.
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Once enabled on devices, consumers can stream their music across Echo and other AVS devices at the same time. For instance, you could play your music on a couple of Echos and a set of standalone speakers at the same time.
Most people, Sonos figures, will have just one or two mic-enabled devices on their network: maybe a Sonos One and an Echo Dot. As long as something can hear you, you can do anything.

As we can see from the illustration, Sonos Set Up With Multiple Echo Devices has many fascinating aspects to explore.
Set up your Echo device: Follow the setup process for your Amazon Echo device, and enable the "Alexa" skill.