Check out an advanced water generation system for Unity.

Crest is a technically advanced ocean system with a number of features for Unity 2019.3 (HDRP 7.2.1 or later). The system features a number of customizable parameters that will let you set all kinds of projects. You can set wave shapes, change underwater dynamics, and more. 

Features:

• Simulated light transport including reflection, refraction, scattering, caustics approximation
• Completely dynamic wave shape with innovative 'equalizer' style wave authoring
• Shallow water - light scattering and wave attenuation
• Underwater with partial submersion
• Dynamic object-water interaction
• Foam simulated from waves and shorelines
• Flow to enable horizontal motion of water volume
• Physics interface with simplistic buoyancy implementations and support for Dynamic Water Physics 2

The set also features a basic set of example scenes. You can find the HDRP version here and the URP version there.